Method of grinding an ornamental chain



June 21, 1955 F. ARMBRUST 2,711,069

. METHOD OF GRINDING AN ORNAMENTAL CHAIN Filed Aug; 6, 1951 9 INVENTOR.

I: ATTORNEY United States Patent METHOD OF GRINDING AN ORNAMENTAL CHAIN Ferdinand Armbrust, Hoxsie, R. I., assignor to Arm- })l'll$t Chain Corporation, a corporation of Rhode sland Application August 6, 1951, Serial No. 240,560

3 Claims. (Cl. 59-35) The present invention relates to the jewelry art, and has particular reference to the method of grinding ornamental chains.

The principal object of the invention is to manufacture an ornamental chain of the cable type.

Another object of the invention is to facilitate formation of an ornamental cable chain having links with inclined outer faces.

A further object is to simplify the formation of ornamental faces on cable type chains.

With the above and other objects and advantageous features in view, the invention consists of a novel method of manufacture and a novel ornamental chain more fully described in the detailed description following, in conjunction with the accompanying drawings, and more specifically defined in the claims appended thereto.

In the drawings,

Fig. l is a plan view of a section of standard type cable chain;

Fig. 2 is a plan view of one link thereof;

Fig. 3 is a section on the line 33 of Fig. 2;

Fig. 4 is a plan view of the section of Fig. 1 after the sides have been shaped to provide flat bevels;

Fig. 5 is a perspective view of one link of Fig. 4;

Fig. 6 is a section on the line 66 of Fig. 5; and

Fig. 7 is a diagrammatic view of one type of apparatus for producing the fiat bevels of Fig. 4.

Ornamental chains of cable type having flat bevels on the outer edges of the chain links have heretofore been made by pressing the sides of the links between pressure dies. Such pressing distorts the links, changes their overall width or their shape, and does not produce fiat bevels having sharp edges. 1 have therefore devised a method of forming fiat bevels on the link sides, which bevels meet in a sharp edge, whereby a very ornamental chain results. The method includes the steps of forming a standard type cable chain from wire by cutting link lengths and looping the cut lengths in interconnected manner, and then filing the sides of the links while holding successive links in right angle angular relation, whereby the filing is facilitated and smooth, highly polished beveled sides meeting in a fine edge result.

Referring to the drawings, the cable chain 10 includes a number of links 11, alternate links designated as 11a being in parallel relation, and connecting links designated 11b being at right angles to the links 11a. Each link 11 is of oval shape, see Fig. 2, of round wire having a circular cross section, see Fig. 3.

The chain 10 is fed, under tension, through a filing device 12, see Fig. 7, which includes two spaced rotating 2,711,069 Patented June 21, 1955 "Ice filing or grinding wheels 13, 14, and two guides 15, 16 positioned between the filing wheels at right angles thereto, the guides having arcuate noses 17. The chain 10 is turned into X shape, and is fed between the filing wheels, the guides being set to maintain the links at right angles, whereby portions 18 of each link side are fiat filed. The partly filed chain may be led through a second filing device similar to the device 12, except that the grinding wheels are in vertical position and theguides are horizontal, or may be turned degrees and passed through the device 12, whereby other portions of the link sides are filed as indicated by the reference numeral 19, the two bevels 18, 19 being at right angles and joining at a narrow edge 20.

The cable chain links are thus turned to X form, held in X form, and filed or ground into square outside shape while so held. 9

The guides 15, 16 may be spring pressed by suitable spring means, not illustrated, but are preferably set and locked to the proper separation to lock the chain links at right angles as they pass between the filing wheels. For large sizes of cable chains, the chain may be filed by passing the chain, while under substantial tension, over a filing wheel or belt, this method requiring four passes, but being preferred where the amount of material to be removed is substantial.

It may be desirable to impart an oscillating motion to the X links, to prevent overheating and burning. For this purpose the guides may be mounted on an oscillating table (not shown), for shifting the chain to and fro over the faces of the grinding wheels.

The resulting ornamental chain 21 is illustrated in Figs. 4 and 6, and is of high quality, as the beveled portions are uniform, with high polish, and with uniform sharp edges.

I claim:

1. The method of ornamenting a cable chain having alternate aligned links and inter-connecting links at right angles to the aligned links, comprising positioning a supporting member opposite to the grinding face of a rotating grinding wheel, positioning a pair of opposed supporting elements between said grinding wheel and said supporting member, drawing said cable chain between said grinding wheel, said supporting member and said supporting elements with said grinding wheel engaging one side edge of the alternate links and with said supporting member engaging the opposite side edge of said links and with said supporting elements simultaneously engaging opposite sides of a plurality of said links and maintaining said aligned and interconnecting links in their right-angular relation.

2. In the method of claim 1, said supporting member being a rotating grinding wheel.

3. In the method of claim 2, said cable chain being turned at right angles and again drawn between the rotating grinding wheel, the supporting member rotating grinding wheel, and the supporting elements, whereby the chain links have their sides right-angularly bevelled.

References Cited in the file of this patent UNITED STATES PATENTS D. 32,618 Bigney May 1, 1900 1,226,616 Moe May 15, 1917 2,424,924 Chernow July 29, 1947 

